/Engine/Plugins/Runtime/GeometryCache/Source/GeometryCacheTracks/Classes/MovieSceneGeometryCacheSection.h
Returns the range to auto size this section to, if there is one. This defaults to the range of all the keys.
the range of this section to auto size to
virtual [TOptional](API\Runtime\Core\IO\TOptional)< [TRange](API\Runtime\Core\Math\TRange)< [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) > > GetAutoSizeRange() const